Note: G : 6.67 x Milum. mpg-mil : 5.97 X 102'1kg, ms\" : 1.99 X 10:30 kg, Rgmh : 6.37 X 106 m. 1. IO kg2 What would happen to the force between the Earth and the Moon if: (a) The mass of the Earth was halved? (b) The distance between them was doubled? . If the Earth had no atmosphere, what speed would an object need to orbit the Earth just above ground level? . The Earth takes 365 days to make a full orbit around the Sun. Use Kepler's third law to nd the distance between the Sun and the Earth. . 50g of steel ((15,991 = 0.11 gCS'E-j) initially at 80cc is placed in 100g of water (cwam = 1 \"Bl ) at g \"a 20C. \\-\\-"hat is the nal temperature when they reach equilibrium? . 50 of ice cm : 0.5 (\"o\"'1 Lice : 80 La] at 10C'- is )laced in 4006 of water cwatcr : 1 cal at g g ( g l c: gm an unknown initial temperature. After the system reaches equilibrium, the nal temperature is measured to be 20C. W hat was the initial temperature of the water